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matlabplotgraph
Aldrich Taylor
Aldrich Taylor

Reputation: 141

Plotting multiple equations in MATLAB

I want to plot multiple functions according to different values of alpha. My function is: x^3+x+y+(alpha)*y=0

ezplot('x.^3 + x + y + y', [-10 10 -10 10]);
hold on
ezplot('x.^3 + x + y + 2*y', [-10 10 -10 10]);
hold on
ezplot('x.^3 + x + y + 3*y', [-10 10 -10 10]);
hold on
ezplot('x.^3 + x + y + 4*y', [-10 10 -10 10]);
...

When I write the code with for loop which does the same work the code shown above, plot does not show nothing. I do not want to just copy and paste to get 100 functions according to 100 different values of alpha. So in this fashion how can I implement this code with using loops?

Four Function Plotted

Figure shows the four equation which are shown above.

Upvotes: 0

Views: 667

Answers (1)

ViG
ViG

Reputation: 1868

As is stated in the comments MATLAB doesn't recommend the use of ezplot. If you're using MATLAB R2017b, then you can use fimplicit. If you don't then you can use both fplot and plot as an alternative. Both, however, need an explicit form. The code for the two latter is then:

for fplot:

for alpha=1:100
    y = @(x) -(x.^3+x)/(1+alpha);
    fplot(y,[-10 10])
    ylim([-10 10])
    hold on
end
hold off

for plot:

x = -10:.1:10;

for alpha=1:100
    y = -(x.^3+x)/(1+alpha);
    plot(x,y)
    ylim([-10 10])
    hold on
end
hold off

I don't have MATLAB R2017b myself, so I couldn't test the code, but if you want to use fimplicit, I think it looks like this:

for alpha=1:100
    fimplicit(@(x,y) x.^3 +x + (1+alpha)*y, [-10 10 -10 10])
    hold on
end
hold off

Upvotes: 3

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